. Carnegie Institution of Washington publication. Fig. 15.—Soil-temperaturea at various depths during 1919. May June July August 5 12 19 36 2 9 16 23 30 8 15 22 29 7 12 20 25. Fig. 16. and —Average day and night temperatures (solid lines) average maximum and minimum temperatures. Indeed, it has been suggested (Shepperd, 1905) that in northern latitudes, where the ground freezes deep in the winter, the soil may be too cold for the roots of cereals to penetrate to a depth greater than 3 feet before midsummer (c/. Pulhng, 1918). The average weekly day and night temperatures are shown in figure 16
. Carnegie Institution of Washington publication. Fig. 15.—Soil-temperaturea at various depths during 1919. May June July August 5 12 19 36 2 9 16 23 30 8 15 22 29 7 12 20 25. Fig. 16. and —Average day and night temperatures (solid lines) average maximum and minimum temperatures. Indeed, it has been suggested (Shepperd, 1905) that in northern latitudes, where the ground freezes deep in the winter, the soil may be too cold for the roots of cereals to penetrate to a depth greater than 3 feet before midsummer (c/. Pulhng, 1918). The average weekly day and night temperatures are shown in figure 16, which also includes the average weekly maximum and minimum tempera- tures. The average for the day temperatures was determined from the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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Keywords: ., bookauthorcarnegie, bookcentury1900, bookdecade1920, bookyear1922
